1 // SPDX-License-Identifier: GPL-2.0-only
9  * Baikal-T1 CCU Dividers clock driver
12 #define pr_fmt(fmt) "bt1-ccu-div: " fmt
18 #include <linux/clk-provider.h>
19 #include <linux/reset-controller.h>
27 #include <dt-bindings/clock/bt1-ccu.h>
29 #include "ccu-div.h"
30 #include "ccu-rst.h"
125  * AXI Main Interconnect (axi_main_clk) and DDR AXI-bus (axi_ddr_clk) clocks
128  * the later is clocking the AXI-bus between DDR controller and the Main
170  * APB-bus clock is marked as critical since it's a main communication bus
171  * for the SoC devices registers IO-operations.
235 	struct device_node *np = data->np;  in ccu_div_set_data()
237 	if (of_device_is_compatible(np, "baikal,bt1-ccu-axi"))  in ccu_div_set_data()
239 	else if (of_device_is_compatible(np, "baikal,bt1-ccu-sys"))  in ccu_div_set_data()
247 	if (of_device_is_compatible(np, "baikal,bt1-ccu-axi"))  in ccu_div_get_data()
249 	else if (of_device_is_compatible(np, "baikal,bt1-ccu-sys"))  in ccu_div_get_data()
262 	for (idx = 0; idx < data->divs_num; ++idx) {  in ccu_div_find_desc()
263 		if (data->divs_info[idx].id == clk_id)  in ccu_div_find_desc()
264 			return data->divs[idx];  in ccu_div_find_desc()
267 	return ERR_PTR(-EINVAL);  in ccu_div_find_desc()
277 		return ERR_PTR(-ENOMEM);  in ccu_div_create_data()
279 	data->np = np;  in ccu_div_create_data()
280 	if (of_device_is_compatible(np, "baikal,bt1-ccu-axi")) {  in ccu_div_create_data()
281 		data->divs_num = ARRAY_SIZE(axi_info);  in ccu_div_create_data()
282 		data->divs_info = axi_info;  in ccu_div_create_data()
283 	} else if (of_device_is_compatible(np, "baikal,bt1-ccu-sys")) {  in ccu_div_create_data()
284 		data->divs_num = ARRAY_SIZE(sys_info);  in ccu_div_create_data()
285 		data->divs_info = sys_info;  in ccu_div_create_data()
289 		ret = -EINVAL;  in ccu_div_create_data()
293 	data->divs = kcalloc(data->divs_num, sizeof(*data->divs), GFP_KERNEL);  in ccu_div_create_data()
294 	if (!data->divs) {  in ccu_div_create_data()
295 		ret = -ENOMEM;  in ccu_div_create_data()
309 	kfree(data->divs);  in ccu_div_free_data()
316 	data->sys_regs = syscon_node_to_regmap(data->np->parent);  in ccu_div_find_sys_regs()
317 	if (IS_ERR(data->sys_regs)) {  in ccu_div_find_sys_regs()
319 			of_node_full_name(data->np));  in ccu_div_find_sys_regs()
320 		return PTR_ERR(data->sys_regs);  in ccu_div_find_sys_regs()
333 	clk_id = clkspec->args[0];  in ccu_div_of_clk_hw_get()
336 		if (div != ERR_PTR(-EPROBE_DEFER))  in ccu_div_of_clk_hw_get()
349 	for (idx = 0; idx < data->divs_num; ++idx) {  in ccu_div_clk_register()
350 		const struct ccu_div_info *info = &data->divs_info[idx];  in ccu_div_clk_register()
353 		if (!!(info->features & CCU_DIV_BASIC) ^ defer) {  in ccu_div_clk_register()
354 			if (!data->divs[idx])  in ccu_div_clk_register()
355 				data->divs[idx] = ERR_PTR(-EPROBE_DEFER);  in ccu_div_clk_register()
360 		init.id = info->id;  in ccu_div_clk_register()
361 		init.name = info->name;  in ccu_div_clk_register()
362 		init.parent_name = info->parent_name;  in ccu_div_clk_register()
363 		init.np = data->np;  in ccu_div_clk_register()
364 		init.type = info->type;  in ccu_div_clk_register()
365 		init.flags = info->flags;  in ccu_div_clk_register()
366 		init.features = info->features;  in ccu_div_clk_register()
369 			init.base = info->base;  in ccu_div_clk_register()
370 			init.sys_regs = data->sys_regs;  in ccu_div_clk_register()
371 			init.width = info->width;  in ccu_div_clk_register()
373 			init.base = info->base;  in ccu_div_clk_register()
374 			init.sys_regs = data->sys_regs;  in ccu_div_clk_register()
375 			init.divider = info->divider;  in ccu_div_clk_register()
377 			init.base = info->base;  in ccu_div_clk_register()
378 			init.sys_regs = data->sys_regs;  in ccu_div_clk_register()
380 			init.divider = info->divider;  in ccu_div_clk_register()
383 		data->divs[idx] = ccu_div_hw_register(&init);  in ccu_div_clk_register()
384 		if (IS_ERR(data->divs[idx])) {  in ccu_div_clk_register()
385 			ret = PTR_ERR(data->divs[idx]);  in ccu_div_clk_register()
395 	for (--idx; idx >= 0; --idx) {  in ccu_div_clk_register()
396 		if (!!(data->divs_info[idx].features & CCU_DIV_BASIC) ^ defer)  in ccu_div_clk_register()
399 		ccu_div_hw_unregister(data->divs[idx]);  in ccu_div_clk_register()
410 	for (idx = 0; idx < data->divs_num; ++idx) {  in ccu_div_clk_unregister()
411 		if (!!(data->divs_info[idx].features & CCU_DIV_BASIC) ^ defer)  in ccu_div_clk_unregister()
414 		ccu_div_hw_unregister(data->divs[idx]);  in ccu_div_clk_unregister()
422 	ret = of_clk_add_hw_provider(data->np, ccu_div_of_clk_hw_get, data);  in ccu_div_of_register()
425 		       of_node_full_name(data->np));  in ccu_div_of_register()
435 	init.sys_regs = data->sys_regs;  in ccu_div_rst_register()
436 	init.np = data->np;  in ccu_div_rst_register()
438 	data->rsts = ccu_rst_hw_register(&init);  in ccu_div_rst_register()
439 	if (IS_ERR(data->rsts)) {  in ccu_div_rst_register()
441 			of_node_full_name(data->np));  in ccu_div_rst_register()
442 		return PTR_ERR(data->rsts);  in ccu_div_rst_register()
453 	data = ccu_div_get_data(dev_of_node(&pdev->dev));  in ccu_div_probe()
455 		return -EINVAL;  in ccu_div_probe()
474 	{ .compatible = "baikal,bt1-ccu-axi" },
475 	{ .compatible = "baikal,bt1-ccu-sys" },
482 		.name = "clk-ccu-div",
520 CLK_OF_DECLARE_DRIVER(ccu_axi, "baikal,bt1-ccu-axi", ccu_div_init);
521 CLK_OF_DECLARE_DRIVER(ccu_sys, "baikal,bt1-ccu-sys", ccu_div_init);